I have consistently found that the settings given by my Minolta Flashmeter III give exposures that appear to my eye to be about 2/3 stop over exposed. I have two of these meters and both agree. Both meters have recently been calibrated by a professional lab and both consistently give continous daylight exposures that agree with Sunny 16 rules. The guide numbers calculated from the under exposed frames more closely agree with the flash manufacturers' GN specification then do the meters' exposure recommendations. Can anyone explain why such descrepancies might exist?